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Move "Image size" under "API Changes"

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To try to keep the headings consistent with before:

https://pillow.readthedocs.io/en/5.2.x/releasenotes/index.html

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33
docs/releasenotes/5.3.0.rst
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@ -1,6 +1,24 @@
5.3.0
-----
API Changes
===========
Image size
^^^^^^^^^^
If you attempt to set the size of an image directly, e.g.
``im.size = (100, 100)``, you will now receive an ``AttributeError``. This is
not about removing existing functionality, but instead about raising an
explicit error to prevent later consequences. The ``resize`` method is the
correct way to change an image's size.
The exceptions to this are:
* The ICO and ICNS image formats, which use ``im.size = (100, 100)`` to select a subimage.
* The TIFF image format, which now has a ``DeprecationWarning`` for this action, as direct image size setting was previously necessary to work around an issue with tile extents.
API Additions
=============
@ -28,6 +46,7 @@ Now it supports three-color mapping with the optional ``mid`` parameter, and
the positions for all three color arguments can each be optionally specified
(``blackpoint``, ``whitepoint`` and ``midpoint``).
For example, with all optional arguments::
ImageOps.colorize(im, black=(32, 37, 79), white='white', mid=(59, 101, 175),
blackpoint=15, whitepoint=240, midpoint=100)
@ -39,20 +58,6 @@ and size, new method ``ImageOps.pad`` pads images to fill a requested aspect
ratio and size, filling new space with a provided ``color`` and positioning the
image within the new area through a ``centering`` argument.
Image Size
==========
If you attempt to set the size of an image directly, e.g.
``im.size = (100, 100)``, you will now receive an ``AttributeError``. This is
not about removing existing functionality, but instead about raising an
explicit error to prevent later consequences. The ``resize`` method is the
correct way to change an image's size.
The exceptions to this are:
* The ICO and ICNS image formats, which use ``im.size = (100, 100)`` to select a subimage.
* The TIFF image format, which now has a ``DeprecationWarning`` for this action, as direct image size setting was previously necessary to work around an issue with tile extents.
Other Changes
=============